Practice Questions

Q32.Match List- I with List- II. List- I List- II Electronic configuration of elements ΔiH in kJ mol−1 (a) 1s22s2 (p) 801 (b) 1s22s22p4 (q) 899 (c) 1s22s22p3 (r) 1314 (d) 1s22s22p1 (s) 1402 Choose the most appropriate answer from the options given below: (1) (a) →(q), (b) →(r), (c) →(s), (d) →(p) (2) (a) →(p), (b) →(r), (c) →(s), (d) →(q) (3) (a) →(p), (b) →(s), (c) →(r), (d) →(q) (4) (a) →(s), (b) →(p), (c) →(q), (d) →(r)

Q32.The CORRECT order of first ionisation enthalpy is: (1) Mg < S < Al < P (2) Mg < Al < S < P (3) Al < Mg < S < P (4) Mg < Al < P < S

Q32.Given below are two statements: Statement I : In the titration between strong acid and weak base methyl orange is suitable as an indicator. Statement II : For titration of acetic acid with NaOH phenolphthalein is not a suitable indicator. In the light of the above statements, choose the most appropriate answer from the options given below: (1) Statement I is false but Statement II is true (2) Both Statement I and Statement II are true (3) Both Statement I and Statement II are false (4) Statement I is true but Statement II is false

Q32.Which of the following are isostructural pairs? A. SO42 - and CrO4 2 - B. SiCl4 and TiCl4 C. NH3 and NO3- D. BCl3 and BrCl3 JEE Main 2021 (24 Feb Shift 1) JEE Main Previous Year Paper (1) A and C only (2) B and C only (3) A and B only (4) C and D only

Q32.In which one of the following sets all species show disproportionation reaction? (1) ClO4- , MnO4- , ClO2- and F2 (2) MnO42 - , ClO2- , Cl2 and Mn3 + (3) Cr2O72 - , MnO4- , ClO2- and Cl2 (4) ClO2- , F2, MnO4- and Cr2O72 -

Q32.The plots of radial distribution functions for various orbitals of hydrogen atom against ' r′ are given below. The correct plot for 3s orbital is : (1) (2) (3) (4)

Q32.At 298 . 2 K the relationship between enthalpy of bond dissociation (in kJ mol-1) for hydrogen EH and its isotope, deuterium ED, is best described by: 1 (1) EH = 2ED (2) EH = ED (3) EH = ED - 7 . 5 (4) EH = 2ED JEE Main 2021 (25 Jul Shift 1) JEE Main Previous Year Paper

Q32.The ionic radii of F− and O2− respectively are 1. 33 A and 1. 4A , while the covalent radius of N is 0. 74A The correct statement for the ionic radius of N3− from the following is : (1) It is smaller than F− and N (2) It is bigger than O2− and F− (3) It is bigger than F− and N, but smaller than of (4) It is smaller than O2− and F− , but bigger than of O2− N

Q32.The correct set from the following in which both pairs are in correct order of melting point is: (1) LiF > LiCl; NaCl > MgO (2) LiCl > LiF; MgO > NaCl (3) LiCl > LiF; NaCl > MgO (4) LiF > LiCl; MgO > NaCl

Q32.During which of the following processes, does entropy decrease ? (A) Freezing of water to ice at 0°C (B) Freezing of water to ice at −10°C (C) N2( g) + 3H2( g) →2 NH3( g) (D) Adsorption of CO(g) and lead surface (E) Dissolution of NaCl in water (1) (A), (B),(C) and (D) only (2) (B) and (C) only (3) (A) and (E) only (4) (A), (C) and (E) only

Q32.The ionic radius of Na+ ions is 1. 02°A. The ionic radii (in °A ) of Mg2+ and Al3+, respectively, are (1) 1. 05 and 0. 99 (2) 0. 72 and 0. 54 (3) 0. 85 and 0. 99 (4) 0. 68 and 0. 72

Q33.The species given below that does NOT show disproportionation reaction is: (1) BrO−4 (2) BrO− (3) BrO−2 (4) BrO−3 JEE Main 2021 (20 Jul Shift 1) JEE Main Previous Year Paper

Q33.Given below are two statements: Statement I : o-Nitrophenol is steam volatile due to intramolecular hydrogen bonding. Statement II : o-Nitrophenol has high melting due to hydrogen bonding. In the light of the above statements, choose the most appropriate answer from the options given below: (1) Both Statement I and Statement II are false (2) Statement I is true but Statement II is false (3) Statement I is false but Statement II is true (4) Both Statement I and Statement II are true

Q33.Given below are two statements: One is labelled as Assertion A and the other labelled as reason R Assertion A : During the boiling of water having temporary hardness, Mg (HCO3)2 is converted to MgCO3 Reason R : The solubility product of Mg(OH)2 is greater than that of MgCO3 . In the light of the above statements, choose the most appropriate answer from the options given below: (1) Both A and R are true but R is not the correct (2) A is true but R is false explanation of A (3) Both A and R are true and R is the correct (4) A and R both are false. explanation of A

Q33.Match List-I with List-II List - I List - II (Elements) (Properties) (a) Ba (i) Organic solvent soluble compounds (b) Ca (ii) Outer electronic configuration 6 s2 (c) Li (iii) Oxalate insoluble in water (d) Na (iv) Formation of very strong monoacidic base Choose the correct answer from the options given below: (1) (a)-(ii), (b)-(iii), (c)-(i) and (d)-(iv) (2) (a)-(iv), (b)-(i), (c)-(ii) and (d)-(iii) (3) (a)-(iii), (b)-(ii), (c)-(iv) and (d)-(i) (4) (a)-(i), (b)-(iv), (c)-(ii) and (d)-(iii)

Q33.The bond order and magnetic behaviour of O−2 ion are, respectively : (1) 1. 5 and diamagnetic. (2) 1. 5 and paramagnetic. (3) 2 and diamagnetic. (4) 1 and paramagnetic

Q33.Which one of the following statements is incorrect ? (1) Atomic hydrogen is produced when H2 (2) At around 2000 K, the dissociation of molecules at a high temperature are irradiated dihydrogen into its atoms is nearly 8 . 1% with UV radiation. (3) Bond dissociation enthalpy of H2 is highest (4) Dihydrogen is produced on reacting zinc with among diatomic gaseous molecules which HCl as well as NaOH . ( aq ) . contain a single bond.

Q33.Given below are two statements: One is labelled as Assertion A and the other labelled as Reason R. Assertion A : Lithium halides are some what covalent in nature. Reason R : Lithium possess high polarisation capability. In the light of the above statements, choose the most appropriate answer from the options given below: (1) A is true but R is false (2) A is false but R is true (3) Both A and R are true but R is NOT the correct (4) Both A and R are true and R is the correct explanation of A explanation of A

Q33.Water does not produce CO on reacting with : (1) CO2 (2) CH4 (3) C3H8 (4) C JEE Main 2021 (25 Feb Shift 2) JEE Main Previous Year Paper

Q33.Which of the following compound CANNOT act as a Lewis base? (1) NF3 (2) PCl5 (3) SF4 (4) ClF3

Q33.The oxide that gives H2O2 most readily on treatment with H2O is : (1) Na2 O2 (2) BaO2. 8H2O (3) SnO2 (4) PbO2 JEE Main 2021 (27 Aug Shift 2) JEE Main Previous Year Paper

Q33.According to molecular orbital theory, the species among the following that does not exist is: (1) He−2 (2) O2−2 (3) He+2 (4) Be2

Q33.In the following the correct bond order sequence is: (1) O2−2 > O+2 > O−2 > O2 (2) O+2 > O−2 > O2−2 > O2 (3) O+2 > O2 > O−2 > O2−2 (4) O2 > O−2 > O2−2 > O+2

Q33.Given below are two statements: Statement I : None of the alkaline earth metal hydroxides dissolve in alkali. Srtatement II : Solubility of alkaline earth metal hydroxides in water increases down the group. In the light of the above statements, choose the most appropriate answer from the options given below: (1) Statement I is correct but Statement II is (2) Statement I is incorrect but Statement II is incorrect. correct. (3) Statement I and Statement II both are incorrect. (4) Statement I and Statement II both are correct.

Q33.(A) HOCl + H2O2 →H3O+ + Cl- + O2 (B) I2 + H2O2 + 2OH- →2I- + 2H2O + O2 Choose the correct option. (1) H2O2 act as oxidizing and reducing agent (2) H2O2 acts as oxidising agent in equations ( A ) respectively in equations ( A ) and ( B ) . and ( B ) . (3) H2O2 acts as reducing and oxidising agent (4) H2O2 acts as reducing agent in equations ( A ) respectively in equations ( A ) and ( B ) . and ( B ) .